It wasn't about unarmed prisoners, but about deserters.
Enacted by Djugashivi/Stalin - a Georgian.
And now this practice is encated by law in modern Ukraine.
PoWs in USSR got better rations than the Soviet citizens. Get your history strait - historical accuracy is not optional thing to serve your needs.
I'm on your side of the argument but I have to point out he could be referring to the Katyn massacre by the NKVD, where thousands of the most educated Poles - officers, doctors, etc. - were rounded up, and executed many with a bullet to the back of the head. (Although I believe, many more were put out on barges then sunk).
The Soviets blamed this crime on the Germans for decades, and many Poles have not forgiven "Russia" for this national catastrophe. Nor has Russia properly apologized or taken responsibly for this, or any of their atrocities against Poland in WWII. Just trying to shed some light on Poland's seemingly pro-banderite stance, but not justify it in any way.
That's the thing. Both Soviet Union, and then Russia acknowledged Katyn. Yeltsin apologised for it. How many apologies are needed? Alas, the latest commemoration that was to be held for the victims of Katyn was mired by a plane crash with the Polish president on board, and in rather strange circumstances.
Here's some chronology:
http://www.kommersant.ru/doc/1354497
Katyn massacre happened on Stalin's orders, so isn't Georgia also part-responsible... Just thinking out loud.
Now what about Volyn massacre: should Ukrainians or, again, Russians apologise for it.